Nowadays, powerful telescopes ... scientists to identify many more small planetsย โthe size of ... or Earth โin other solar systems.
allows, Mars
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10
Seth Shostak and Alexandra Barnett are ... . They believe intelligent life exists somewhere in the ... .
astronomers, universe
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15
In fact, intelligent beings could be trying to communicate with us now, but we may not have the right ... to receive their ....
tools, messages
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15
Is there intelligent life on other planets? For years, scientists said "No". But today, this is ...
changing
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20
Shostak and Barnett think intelligent life exists on other planets because of two reasons. The first reason is ..., and the second reason is ... .
1. time (They believe the universe is 12 nillion years old. This is too long to have only 1 planet that has intelligent life). 2. size (The universe is huge)
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15
Within the next 20 years, we could make ... with other life forms in our universe
contact
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20
In the past, it was difficult to ... signs of intelligent life in the universe.
search for
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15
The ... between planets is too great. Despite this, intelligent beings might eventually contact us using other methods such as ...